/*
 * Copyright (C) 2021 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.sentry.adapters;

import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;

import java.lang.reflect.Type;
import java.util.Collection;

import org.jetbrains.annotations.ApiStatus;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

/**
 * Serializes collections to JSON. When collection is empty or {@code null}, returns {@code null}.
 *
 * @since 2021-06-02
 */
@ApiStatus.Internal
public final class CollectionAdapter implements JsonSerializer<Collection<?>> {
    @Override
    public @Nullable JsonElement serialize(
        final @Nullable Collection<?> src,
        final @NotNull Type typeOfSrc,
        final @NotNull JsonSerializationContext context) {
        final JsonArray array = new JsonArray();
        if (src == null || src.isEmpty()) {
            return array;
        }
        for (final Object child : src) {
            JsonElement element = context.serialize(child);
            array.add(element);
        }
        return array;
    }
}
